Back in September I bought the Central Machinery 2HP Dust Collector. It is doing what all I wanted except when I turn it off it whines down with a horrible screeching noise. I hesitate to start putting grease anywhere. I see on the instructions diagram there is a “packing” washer like thing and wonder if that could be the issue. The noise is worse than fingernails on a chalkboard and since I am in the attached Garage it just transfers into the house. Ugh!!

Anyone else have or had this problem?

-- "Simplicity and repose are the qualities that measure the true value of any work of art." Frank LLoyd Wright

9 replies so far

You don’t give us a whole lot of information to go on, but I will give it a whirl. It is possible that the impeller has come loose and moved down the motor shaft and is making contact with the fan casing/cover. When the DC is operating the air is flowing into the center of the fan, which pushes the fan away from the cover—hence you don’t hear the noise. However, when you turn it off, that inward force is no longer there and the fan can move outward toward the cover. If the fan is loose on the motor shaft it could move as I have described above. Another possibiliity is that you have sucked in something that is caught on one of the fan blades, but it only makes contact when the inward air pressure is released.

I would take out the row of screws/bolts around the face of the fan housing and remove the cover. It is a good idea to mark one of the hole positions on the fan case which will make it easier to get it back together. Once you can see the fan you should be able to determine the cause of your mysterious noise.

I think it is sad DKV, when someone makes a request for help that all you can come up with is sarcasm. For someone who uses an avatar depicting the Jesus that I know, this seems like a curious response.

Mine screeches like a banshee when it’s initially turned on, then goes quiet after a few minutes. I attribute it to being cold, it being winter and all, because it doesn’t screech when it’s warm. I’ve disassembled it a “thousand” times and found nothing wrong. Cold bearings?

-- When I was a kid I wanted to be older . . . . . this CRAP is not what I expected !